SAMPI HPV Hydraulic Valve - Manual

The operating principle is as follows:
The fluid passes from the “inlet chamber” to the “intermediate
chamber” through a hole in the cap and then through a dirt-proof
filter. Then, it fills the “shutter chamber” through an orifice. Next,
it reaches the solenoid valve holder block through a connecting
hole. Inside the block the fluid finds two paths that run parallel to
each other to reach the “discharge chamber”. The fluid undergoes
to pressure drops along this path depending on the opening level
of the orifices and on the opening of the valves. An intermediate
pressure is established between the delivery pressure and the
discharge pressure, as a result of these pressure drops in the
“shutter chamber”. Together with the contrasting action of the
spring, this pressure moves the axial position of the shutter,
which, in turn, influences the upstream/downstream pressure
values of the valve and therefore also the “shutter chamber”
pressure. Consequently, the equilibrium of the forces is further
modified, which regulates the position of the shutter itself. This
phenomenon ceases once the position of equilibrium is reached,
where the effect of the pressure of the “shutter chamber”, added
to the force of the spring, is equal to the effect of the delivery
pressure.
HPV Hydraulic Valve
Specifications Sheet
Other features
The valve works according to three operating regimes;
•
Closed;
•
Intermediate low flow position;
•
High flow position.
The high flow position can, at worst, also coincide with the valve position completely
open, but nonetheless it can be regulated to limit the capacity of the line. The high
and low flow positions are regulated manually from the outside by means of needles
for adjustment.
Materials
Part Material
Body Carbon steel or aluminium
Shutter Alluminium
Fixed parts Aluminium
Other details Stainless steel or carbon steel
Dynamic sealing ring PTFE loaded carbon
Shutter seal packing Viton on incorporated metallic core
Rest of the packing Viton